Burglar-alarm clock



(No Model.) 3 Sheets-Sheet 1.

O. E. BURNHAM.

BURGLAR ALARM CLOCK. No. 360,338. Patented Ma.1-.29, 1887.

WITNESSES (No Model.) 3 Sheets-Sheet 2.

O. E'. BURNHAM.

BURGLAR ALARM CLOCK.

No. 360,338. Patented Mar. 29, 1887.

WITNESSES INVEJV TOR ",1

I; I Attorney PETERS. Phnln-Lnhognplmr. Wnshinglun. 0) c,

(No Model.) 7 3 Sheets-Sheet 3.

C. E. BURNHAM.

BURGLAR ALARM GLOOK.

No. 360,338. Patented Mar. 29, 1337.

lul nll In W1 TJV'ESSES ag 01757 ri Attorney UNITED STATES ATENT -rricn.

CHARLES E. BUR'NHAM, OF \VHITE PLATNS, NEW YORK.

BURGLAR-ALARM CLOCK.

SPECIFICATION forming part of Letters Patent No, 360,338, dated March 29, 1887.

Application filed Dccemb'. r 9, 1886.

To aZZ whom it may concern.-

Beitknown that l, CHARLES E. BURNHAM, a citizen ofthe United States ofAmerica, residing at White Plains, in the county of \Vestchester and State of New York, have invented certain new and useful Improvements in Burglar- Alarm Clocks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

This invention relates to alarm attach ments for ordinary marine clocks.

The object of theinvention is to so construct the clock-train with the alarm device that the clock may be used as an ordinary time-piece, an ordinary alarm clock, or an alarm to give notice of the opening or attempted opening of a door.

Theinvcntion consists of novel features and combinations, to be hereinafter described, and pointed out in the claims at the close of this specification.

In the accompanying drawings, Figure l is a View in side elevation showing the burglaralarm clock suspended from the knob-spindle of a door. Fig. 2 illustrates the clock and its burglar attachment in rear elevation. Fig. 3 is a rear elevation of the clock-case and movement-frame, with so much of the train as is connected with the alarm. The back plate of the clock is removed. Fig. & is a side elevation of the movementand its frame, the'clo'ckcase being shown in vertical section. Fig. 5 is a detail perspective of the burglar-alarm detent. Fig. 6 is a detail perspective of the alarm-verge and its attachments. Fig. 7 is a detail perspective of the time-movement alarmdetent. Fig. 8 illustrates a part of the back plate of the clock-case, and Fig. 9 is a detail perspective of the alarm-pinion.

The clock case and movement are of ordinary construction, except the parts hereinafter particularly described. The clock-case A is cylindrical and provided with the usual back plate, A, having a flange which fits within the rear open end of the case. The head of the bell-standard B is provided with a hori- Serial No. 221,099. (No model.)

zontal perforation extending from front to rear, in which is journaled a pivot-stud, 0, projecting from the front of the alarm-lever O. A broad pinion, D, is mounted to rotate and slide longitudinally upon a spindle, D, jourualed in the movement-frame, and this pinion gears with a pinion, H, rigidly secured to the hourhand spindle H. A notch, d, is formed in the inner end of the hub of the pinion D, to engage a pin, d, projecting from spindle D, and said hub is elongated at its inner end to receive the pressure of the time-alarm detent E. This time-alarm detent E is formed of spring metal, and is secured at one end to the move ment-fraine, and is provided at its free end with a spur, e, which is held normally in the path of an arm, f, secured to the verge-arbor F of the alarm mechanism by means of the elongated hub of wheel 1). The time-alarm detentE is also provided, at a point intermediate between its fixed and free ends, with a perforation, within which the spindle D turns freely.

The pinion D is constantly rotated upon its spindle D by engagement with the pinion H of the hour-hand spindle, and is of such thickness that it may be shifted back and forth longitudinally on said spindle through the agency of notch d, pin (1, and detent E without being disengaged from said pinion H, and the spin dle D, while normally held by friction from turning in its bearings, is still capable of rotation upon the application of sufficient force to the thumb-button 61', secured to its outer end, which projects beyond the case. A push rod, D, is seated in guides in the movementframe, its outer end projecting through the case and its inner end in contact with the detent E.

The mechanism so far described will operate as follows: The spindle D will be turned by application of force to its thumb-button d to bring the hand c at its inner end opposite the number on the small dial on the face of the clock, indicating the time at which the alarm is to be sounded. This changes the position of pin (1 with relation to notch (Z, or, in other words, places the pin (1 at such position that at the desired time the notch (Z will be brought opposite said pin and the wheel D be shifted by detent E toward the face of the clock, thus permitting the spur c to retreat IOC from the path of the arm f of the verge arbor and releasing the alarm mechanism.

To the outer plate of the movement frame is secured the lower end of a spring, G, the upper or free end of which terminates just within the clockcase. At the upper end of this spring is secured a fiat stop or detent, g, projecting toward the face of the clock and resting normally in the path of the free end of a bent arm, f, secured to the verge-arbor F of the alarm mechanism. A stud, 9, projects outwardly through a curved slot in the back plate of the clock, and is engaged by the forked lower end of the alarm-lever O. The upper end of this alarm-lever G is provided with a jaw and set-screw, by means of which it may be clamped tightly to the knob-spindle of a door.

A switclrbutton, G, is pivoted to the back plate of the clock-case in such position that it may be turned to rest upon the outer end of push-rod D, thus forcing and retaining the spur e of the timealarm detent E out of the path of armfof the verge-arbor F; or it may be turned upward to *rest against the side of the lower end of the alarm lever O, (or the stud g',) thus holding the stud g of the burglar-alarm detent at the extreme end of the slot within which it works, and holding the burglar-alarm detent g out of the path of the arm f of the arbor F; or it may be turned to a point between said stud g and push-rod D.

The operation of the alarm mechanism of the clock as an entirety will be as follows: When the switchbutton G is in the position shown in solid lines-in Fig. 2, the time-alarm detent 6 will be held out of the path of the arm f of arbor F, when the burglar-alarm detent 9 will be in the path of the arm f of arbor F, thus preventing the movement of said arm and arbor and the sounding of an alarm. If, now, the alarm-lever Gis rocked upon its pivot c,the stud y will be thrown to one end of its slot and the burglar-alarm detentgwill be moved from the path of the arm f of arbor F, thus permitting the alarm tobe sounded. The locking of this lever, as described, would of course be caused by the turning in either direction of the door-knob to the spindle of which the alarmlever had been secured. If the switch-button G is turned to a point intermediate between the push-rod D and stud 9', both the timealarm detent e and the burglar-alarm detent y will be in the path ofthe respective arms f f of arbor F, thus preventing the sounding of an alarm, and adapting the clock for use as an ordinary time-piece. If the switch-button G is turned to press the stud g to one end of its slot in the back plate, A, of the clock, the burglaralarm detent y will be removed from the path of the arm f of arbor F; but the push-rod D will be free, thus adapting the clock to be used as an ordinary alarm-clock.

It will be understood of course that when the clock is in use as an ordinary time or alarm clock the burglar-alarm lever C may be re moved, and when this is done the switchbutton G would come in direct contact with the stud y when the bnrglar'alarm detent g is to be held away from the path of the arm f,- but it is immaterial whether this switch-button G engages with the lower end of the alarm-lever Gor the stud g, as it is evident that the result will be the same.

I claim 1. The combination, with an alarm clock, of aburglar-alarm detent arranged to normally prevent the operation of the alarm mechanism, and an alarm-lever pivoted to a fixed portion of the clock to control the movement of said detent, said lever being adapted to be clamped to a door-knob spindle.

2. The combination, with an alarm-clock, the alarm-verge arbor of which is provided with an arm,f, of a spring-plate provided at its. free end with a detent held normally in the path of said arm f, and an alarm-lever pivoted to a fixed part of theclock and provided at one end with ajaw and set-screw, arranged at its other end to engage a stud projecting from said detent.

3. The combination, with an alarm-clock, of the verge'arbor provided with armsff, the time-alarm detent and push-rod for shifting said detent, the burglar-alarm detent, and the switch-button, substantially as described.

4. The combination, with an alarm-clock having an arm,f, secured to the verge-arbor, of a spring secured to the movement-frame and carrying at its free end a detent, the alarm-lever pivoted upon the bell-standard, and provided atits upper end with a jaw and set-screw and at its lower end with a fork to engage a stud projecting from said burglaralarm detent, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES E. BUBNHAM.

W'itnesses:

WVILsoN BROWN, J r., W'M. M. SKINNER, Jr. 

